They can keep this over priced glossy display. At our lab, we have a bunch of iMacs with glossy displays; it's like a room full of mirrors. They are terrible unless you make the room dark. I'm sure the 27" is going to be pretty, but will it be functional compared to what you can get from Dell or NEC? I think not.
Only when there is a lot of lighting and when the computers are turned off. Dell and NEC both sell glossy displays but also offer matte options. So your logic doesn't make sense in either situation. Matte is form over function. It reduces glare but the main point of a monitor is to see what's being displayed. Glossy doesn't block light, matte coatings do.